Mitsubishi Electric e Series Service Handbook page 41

[ II Restrictions ]
(5) Suspended solids in the water
Sand, pebbles, suspended solids, and corrosion products in water can damage the heating surface of the heat
exchanger and cause corrosion. Install a good quality strainer (20 mesh or better) at the inlet of the unit to filter
out suspended solids.
Removing foreign substances from the water system
Consider installing a settlement tank or a bypass strainer to remove foreign substances from the water system.
Select a strainer capable of handling two to three percent of the circulating water. The figure below shows a
sample system with a bypass strainer.
(6) Connecting pipes made from different materials
If different types of metals are placed in direct contact with each other, the contact surface will corrode.
Install an insulating material between pipes that are made of different materials to keep them out of direct
contact with each other.
(7) Piping material
Use hot water output piping material that can withstand heat of 60°C or more. Use hot water input piping
material that can withstand the maximum input water temperature. All piping must be ma de of SUS or similar
material to withstand corrosion.
HWE1417B
Load system unit
Heat pump unit
Strainer (20 mesh or its equivalent)
Pump
Bypass strainer (100 mesh or its equivalent)
- 32 -
Tank
GB